I change to different versions of Proton but the game refuses to run on my Ubuntu PC. Do I need some other kind of dependency in order to have it run?

I was trying out the movement changes in the demo update and for the most part everything felt fine; things felt a little less floaty which was good. One thing in particular stood out to me and that was that the basic double jump seems to stop momentum very abruptly now. It's most notable when you delay the second jump or after being launched forward by a ninja kick. Just felt like giving some feedback since double jumping feels awkward now and I'm curious whether that change in feeling is intentional....

I'm gonna look like a doofus when someone eventually proves me wrong but pic related is seemingly impossible to make and feels like too high a step in difficulty, even when accounting for some of the tech I found. I've missed this jump enough that I've alt+tabbed to make this post and ask if I came here too early and I was supposed to get something else first? Cuz it really feels like I'm sequence breaking with how hard this has stumped me. https://gtm.steamproxy.vip/sharedfiles/filedetails/?id=34766418...

It gives me a "The UE-Praxis Game has crashed and will close" warning with "fatal error" as the reason, my praxis user is 0.25.05.17.19, dunno if it's useful. I'm trying to run it on a integrated graphics laptop with a Intel i5-10210U CPU @ 1.60GHz 2.11 GHz and 24gb of RAM...

I jumped over the lava using the rotating platforms, flicked the switch, went out of that room, it says find the boss room,, but I see no way to progress. I watched a YouTube demo walkthrough and there is a platform you can jump on thats not there in the demo when I play. It may be a high FPS bug, I have a 240hz lcd. See this picture: https://drive.google.com/file/d/1dFHFBX1J0itZmJfLghH4DlttPH_I1dtB/view?usp=drive_link...